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The Effect Genomics Has On The August New Release Sires

With the recent proof release, breeders now have the opportunity to start seeing the effect of genomics has on the top new proven sire proofs. Thanks to the Canadian System and CDN (Canadian Dairy Network) we can even take one-step further and get a better appreciation  of how genomics actually is affecting sire proofs.

The Process

In an effort to  better understand these effects The Bullvine took a look a closer look at the top 5 new release sires. We looked at their official proofs, DGVs (Direct Genomic Values) and PAs (Parent Average).  We also calculated what the sire’s current YS (Young Sire) index would have been  (based on the CDN formula  of 65% DGV and 35% PA) to see what their current index would have been without daughter information.  We then took each of these parts and compared them to each other. The results are as follows.


Trait GLPI Milk Fat Protein %F %P Conf
Official 2638 1307 67 55 0.18 0.10 13
DGV 2605 1289 66 55 0.18 0.10 12
DGV Diff 33 18 1 0 0.00 0.00 1
PA 2003 1484 74 44 0.20 -0.04 9
PA Diff 635 -177 -7 12 -0.02 0.14 4
YS 2394 1357 69 51 0.19 0.05 11
YS Diff 244 -50 -2 4 -0.01 0.05 2

What stands out in BRAWLER’s official proof is that he actually outperforms his DGV and parent average indexes.  While the general expectation has always been that high genomic sires will drop, with the addition of daughter information, BRAWLER is a high genomic sire that actually increased his values.  Note that his official values for protein, conformation and LPI significantly exceed his PA values. One of the interesting points on BRAWLER is that his official conformation score is higher than both his DGV and PA values.  It appears that so far his daughters are performing much better than his parent average or DGVs predicted, especially in mammary traits.


Trait GLPI Milk Fat Protein %F %P Conf
Official 2305 1670 45 48 -0.17 -0.05 12
DGV 2726 1730 50 52 -0.14 -0.05 14
DGV Diff -421 -60 -5 -4 -0.03 0.00 -2
PA 2016 1399 62 42 0.10 -0.04 9
PA Diff 290 271 -17 7 -0.27 -0.02 3
YS 2477 1614 54 48 -0.06 -0.04 12
YS Diff -172 56 -9 0 -0.11 -0.01 0

While BRAWLER’s PA and DGV actually held him back,  we see the exact opposite effect for DORCYNOTE: Due to the need for DGV’s we have had to look at US proven bulls on the CDN system.  DORCY posts outstanding DGV values, but so far his daughters are falling short of those values, especially for fat, udders and legs.  In fact, his DGV’s actually elevate his proof, by our estimate, by almost 30%.  While these early daughters (65) may not be a complete indication of where his proof will end up, current daughter values would predict that we should see declines in these traits.


Trait GLPI Milk Fat Protein %F %P Conf
Official 2305 1419 63 75 0.10 0.24 10
DGV 2291 1465 65 77 0.09 0.24 10
DGV Diff 14 -46 -2 -2 0.01 0.00 0
PA 1710 1190 45 49 0.05 0.09 10
PA Diff 596 229 19 27 0.05 0.15 0
YS 2087 1369 58 67 0.08 0.19 10
YS Diff 218 50 5 8 0.02 0.05 0

While BRAWLER’S official proof is higher and DORCY’S is lower than their DGVs, JAY’S official proof is bang on.  The biggest difference between his young sire proof and his official proof is that his parent averages are actually much lower than his DGVs and daughter information.


Trait GLPI Milk Fat Protein %F %P Conf
Official 2183 2042 49 58 -0.26 -0.07 12
DGV 2333 1917 50 56 -0.22 -0.04 14
DGV Diff -150 125 -1 2 -0.04 -0.03 -2
PA 2127 1910 65 55 -0.06 -0.06 10
PA Diff 56 132 -16 3 -0.20 -0.01 2
YS 2261 1915 55 56 -0.16 -0.05 13
YS Diff -78 127 -6 2 -0.10 -0.02 -1

EXPLODE joins his fellow US proven DORCY in finding it hard to live up to his high DGV values.  Similar to DORCY, EXPLODE’s daughters are lower than his DGV’s for feet and legs, as well as rump and protein.  However, so far his daughters are proving to be much more durable than his DGV did predict over his parent average.


Trait GLPI Milk Fat Protein %F %P Conf
Official 2171 796 68 45 0.38 0.17 12
DGV 2207 778 67 44 0.39 0.17 11
DGV Diff -36 18 1 1 -0.01 0.00 1
PA 2035 963 57 46 0.22 0.13 12
PA Diff 137 -167 11 -1 0.17 0.04 1
YS 2147 843 64 45 0.33 0.16 11
YS Diff 24 -47 5 0 0.05 0.01 1

Much like the other Canadian proven sires, BORIS’s DGV values are bang on, with only a slight variation where his daughters are  currently outperforming predictions for feet and legs.

Interesting Note

When we applied the same analysis to Co-Op Bosside Massey, we see that his daughter information was much higher than both his parent average and DGVs, hence explaining with the addition of more daughters Massey’s proof increasing.

The Bullvine Bottom Line

While most of the early top genomics sires are still awaiting proofs, this analysis of a small group shows some interesting trends.  First it shows that there may be differences from country to country in the accuracy of predictions (Editors note: As we have now crunched over 200 US sires we see that this is no longer the case, these two are more an anomaly than the standard.  Watch for the results of this number crunching in a future Bullvine post).  It also shows that, at least in the Canadian case, the DGV values are a much better indicator of potential than the old PA system predictions.  This could be because genomics so far has been able to limit the effects of hot house herds (read Has Genomics Knocked Out Hot House Herds). In looking at the differentials for these five sires, we see that DG Values vary by 6% from official LPI Proofs, while their PA’s vary by 15%.  This is in line with CDN’s prediction of a 5% accuracy gain, as a result of using genomics for calculating first crop proven sire proofs.  Furthermore, it shows that with daughter information added top genomics sires, can actually outperform their high parent average and DGV predictions.

For more information check out our Genetic Evaluation Resource Center.


  1. Great read!!! Very interesting to see these results. I would be very interested to see some of the not so high daughter proven former high genomic bulls added into this equation and though I am impressed with what genomics has proven in these bulls, I think that would give us a great view of the whole picture.

      • One young sire I used (Snowbird) from the time of his initial DGV came out to his actual proof is around 2000 points lower. Mainly because his high components were boosted by decent milk numbers but he turned out to be a complete dud for milk. And his type proof predicted what his strengths were correctly just was way off on how good those traits were.
        So even though I am a believer in genomics I doubt many of these new high >3000 GLPI young sires will be well over 2000 when they are at 90% reliability.

        • Mathew,
          We are currently crunching some numbers, we have started to see a trend that genomics sires whose DGV’s are below their PA’s or both their parents are below their EBV’s we are finding take big drops. Causing me some concern in using them. Once complete will share our findings.


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